US2282075A

US2282075A - Motor drive operating mechanism for roll film cameras

Info

Publication number: US2282075A
Application number: US333177A
Authority: US
Inventors: Mihalyi Joseph
Original assignee: Eastman Kodak Co
Current assignee: Eastman Kodak Co
Priority date: 1940-05-03
Filing date: 1940-05-03
Publication date: 1942-05-05
Anticipated expiration: 1959-05-05

Description

J. MlHALYl May 5, 1942.

MOTOR DRIVE OPERATING MECHANISM FOR ROLL FILM CAMERAS Filed May 3, 1940 4 Sheets-Sheet l JOSEPH JMIHALYI INVI'E TOR AW ORNEYS May 5, 1942. J. MIHALYI 2,282,075

MOTOR DRIVE OPERATING MECHANISM FOR ROLL FILM CAMERAS Filed May 3, 1940 4 Sheets-Sheet 2 FIG. 6. Q n

99 JOSEPH MIHALY! 98 IN VEN TOR A TTORNE YS J. MIHALYI May 5, 1942.

MOTOR DRIVE OPERATING MECHANISM FOR ROLL FILM CAMERAS Filed May 3, 1940 4 Sheets-Sheet 3 JOSEPH MIHALYI INVENTOR W/Mv ATTORNEYS May 5, 19142. J.- MIHALYI 2,282,075

MOTOR DRIVE OPERATING MECHANISM FOR ROLL FILM CAMERAS Filed May '3, 1940 4 Sheets-Sheet 4 JOSEPH MIH4LY] IN NTOR BY W ATTORNEYS Patented May 5, 1942 2,282,075 MOTOR DRIVE OPEBATINGJIECHANISM FOR ROLL FILM CAMERAS Joseph Mihalyi, mum N. Y., asslgnor to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey Application May 3, 1940, Serial No. 333,177

14 Claims.

which is controlled from and in timed relation with the filmwinding mechanism.

A further object of the invention is the provision of a locking device which is applied to the governor shaft of the spring motor unit, the governor shaft being the part carrying the least load.

A still further object of the invention is the provision of such a locking device which cooperates with an independent locking latch to insure the locking of the motor drive unit and the film winding mechanism at the completion of each film winding operation.

Yet another object of the invention is the provision of a locking device which is released upon actuation of the shutter so as to free motor power unit so the latter may be rendered effective to wind up the exposed film area and to si multaneously move an unexposed 'area into exposing position, yet which is automatically moved into locking engagement with the governor shaft of the power unit to arrest iurther rotation of the winding means when the new film area is in position.

Still another object of the invention is the provision of a locking mechanism which is simple in construction, relatively inexpensive to manufacture, automatic and positive in its action, and requires .no attention on the part of the camera user.

To these and other ends, the invention resides in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Fig. 1 is a top plan view of a camera provided with a spring motor drive which is locked by a locking device constructed in accordance with the present invention;

Fig. 2 is a fragmentary sectional view of a portion .of the camera illustrated in Fig. 1, but on a larger scale than the latter, with parts in section and parts in elevation, showing the relation of the dim measuring shaft and the control mechanism tor the locking device for the film winding mechanism;

Fig. 3 is a fragmentary view through another portion oi the camera and on a larger scale than Fig. 1, showing the dual locking arrangement for the spring motor drive;

Fig. 4 is a. vertical sectional view taken substantially on line 4-4 of Fig. 3 showing the relation of the two locking mechanisms for the governor shaft and the spring motor drive:

Fig. 5 is a fragmentary top plan view of a portion of the locking device control mechanism illustrated in Fig. 'i, but on a larger scale than the latter, showing the arrangement of the pivo'tal lugs mounted on the ends of a slidable bar, and a cooperating lug for preventing the locking oi the spring motor unit until exposure has been completed;

Fig. 6 is a bottom plan view of the camera illustrated in Fig. 1, showing the arrangement for detachably securing the motor drivennit back to the camera body;

Fig. 7 is a fragmentary view through a portion of the camera, on a somewhat larger scale than Figs. 1 and 6, with parts in section and parts in elevation, showing the relation of the spring motor drive and the slidable control bar for the motor locking mechanism;

Fig. 8 is a vertical sectional view taken substantially on line 3-8 of Fig, 1, showing the spring motor drive with its locking device and the control mechanism for the device, the rear camera wall being partly broken away to show the locking ratchet for the spring motor;

Fig. 9 is a fragmentary view of a. portion of the mechanism illustrated in Fig. 8 but on a larger scale than the latter, showing the end of the governor shaft for the spring motor drive,

and the relation thereto of the two locking members therefor;

Fig. 10 is a side view of the mechanism illustrated in Fig. 9;

Fig. 11 is a longitudinal sectional view through the motor drive unit and camera back when removed from the camera, and taken substantially on line ll-ll of Fig. 12; v

Fig. 12 is a plan view of the motor drive unit removed from the camera as it would appear if viewed on line l2--|2 of Fig. 11;

Fig. 13 is a fragmentary plan view of a portion of the mechanism illustrated in Fig. 2, but on a larger scale than the latter, showing the arrangement oi the various locking members at the completion of the film winding operation; and

Fig. 14 is a view similar to Fig. 13, but showing the relation of the parts just after the actuation of the shutter trigger.

Similar reference numerals throughout the various views indicate the same parts.

The present invention is embodied in the present instance, by way of illustration, in a small size camera adapted for taking a large number of exposures on miniature marginal perforated film, such as motion picture film. The camera comprises a body portion 20 the front of which carries a sleeve 2| which houses the objective lenses, not shown. Focusing is secured by turn{ manner clearly shown and described in this pat- I ent to which reference may be had for a detailed description. This motor device may be briefly described as being mounted in a housing 23 car ried by a plate 24, the ends of which are curved at 25 and 26 to form walls of a spool chamber, not shown. One edge 21 of the plate 24 carries hinge members which cooperate with complementary hinge members on the body 20 to provide a hinged connection 28 between the plate 24 and'the camera body 20, as shown in Fig. 6. These hinged members are detachably connected in a manner set forth in the above-mentioned patent so that the motor drive unit may be detachably secured to the camera body.

In order to detach the motor drive unit and its supporting plate 24, a latch on the plate 24 must first be released. This latch comprises a slidable button 29 movable in a recess, not shown,in the plate 24, and carrying a stud 30 which is adapted to slide in a slot 3| in the plate 24, see Fig. 3. The under side of the button 29 is formed with a slot 32 having a radial portion 33 and a curved portion 34 connected to the portion 33 and concentric with the stud 30. This slot is adapted to receive a pin 35 on the plate 24. To release the plate 24 from the body 20, the button 29 is first rotated in a clockwise direction, as viewed in Fig. 3, to cause the curved portion 34 of the button to move over the pin 35 until the latter registers with the radial portion 33. a

The button is then slid to the right, as shown in Fig. 3. An L-shaped latch bar 36 is connected to button 29 by means of the stud 30 so that the rightward movement of the button also similarly moves the bar 36 to the position shown in Fig. 3 to release the bar 36 from cooperating lugs, not shown, on the camera body. In this released position, a book 31 on the arm 38 of the bar 36 is positioned'to engage lugs 39 formed on a disk 40 carried on the end of the governor shaft 4I- of the motor mechanism, to be later described. By means of this arrangement, the motor drive unit is locked so that it will not run down or unwind when removed from the camera body. This governor shaft 4| is connected through a suitable gear train to the spring motor 42 which,

in turn, is geared to a disk-shaped or crown gear 43 which meshes with and drives a gear 44 operatively connected to the film winding mechanism to rotate the latter to move the film strip across the camera.

The above-described mechanism is substantial- 1y that shown and described in the applicant's Patent No. 2,135,984, issued November 8, 1938. As such mechanism does not per se constitute a part of the present invention, it is believed that a further detailed discussion is not necessary to a complete understanding of the present invention.

The gear 44 is secured to one end of a measuring roll shaft 48 on which are mounted a pair of sprockets 49, only one of which is-shown, adapted to engage the marginal perforations of a film strip to move or feed the latter across the camera. The gear 44 is, in turn, connected through a suitable gear train, designated broadly at 50, to the take-up spool 5| to positively drive the latter to wind the film strip thereon. In order to compensate for increasing diameter of the film on a spool 5|, the latter is provided with'a suitable slip clutch, not shown. As such a clutch does not constitute a part of, and is not necessary to a complete understanding of, the present invention a showing thereof is not deemed necessary.

The shaft 48 has a portion 52 which extends through a wall 53 of the camera body 20 and into a mechanism compartment 54. This compartment houses various control mechanisms, but only so much of these mechanisms will be shown and described as is necessary to fully understand the present invention. The portion 52 of the shaft 48 has fixed thereon a holding ratchet 55 having a single tooth or shoulder 56. A stubshaft, not shown, is' positioned in the compartment 54 in axial alignment with the shaft 48 and has secured thereto a fiat circular disk 51. A pawl 58 is pivoted at 58 on the disk 51 and is normally held in engagement with the tooth 55 by means of a spring 60 carried by the disk 51. It is now apparent that when the measuring roll shaft 48 is rotated by thespring motor drive to shift the film strip, the ratchet 55 will be rotated in a clockwise direction, as viewed in Fig. 13. Such rotation will cause the tooth 56 to engage the pawl 58 to similarly rotate the disk 51. Such rotation of the disk will turn the stub-shaft on which the disk is mounted. This shaft also has mounted thereon a gear 6| which is operatively connected to a gear 62 on a stub-shaft 63 which turns a second gear 64 adapted to mesh with the gear 65 on the shutter curtain tensioning shaft 66. It is thus apparent that as the film is fed and wound, the shutter is also tensioned. The details of the connection between the measuring roll shaft 48 and the shutter tensioning shaft 66 are fully set forth in the applicants Patent No. 2,253,084, issued August 19, 1941, or active Patent No. 2,140,446, issued December 13, 19-38, to which reference may be had for a more detailed disclosure.

The pivot pin 59 of the pawl 58 is a stud which depends from the disk 51- and into the path of an upturned ear 69 formed on the end of a slidable bar, generally indicated by the, numeral 10, see Figs. 2 and 7. As mentioned above, the winding of the film turns the disk 51 in a clockwise direction, as viewed in Fig. 13. When the film has been moved a distance of one image area,

the disk 51 is moved to a positionin which the pin 59 engages the ear 63, see Fig. 2 and slides the bar 10 to the left, as viewed in Fig. 2, or to the right as viewed in Figs. 3, 5, 7, and 8. The bar 10 is suitably guided on thewall 53 and is of the shape best shown in Fig. 8, and has a lower horizontal portion II to which the ear Cl is secured, as will be later described. The bar I. is also formed with a vertical intermediate portion 12 and an upper horizontal portion II, the latter carrying a hook II which is adapted to slide over teeth 1.! formed on the under side of a counter dial 16 when the bar III is slid in the direction above described.

An operating button or trigger I8 is slidably mounted in the upper left-hand corner of the camera body. Downward movement of the trigger serves to actuate a shutter to make an exposure, and to also swing a bellcrank II ina counter-clockwise direction about its pivot ll, see

Fig. 2, against the action of a spring II; and,-

through a link 82 which connects the bellcrank with an upturned lug 83 on a release bar 84, to pull the latter to the left about its pivot 85. At this point, a lug 86 on the lever 84 engages the free end 81 of the pawl 58 and swings the latter in a counter-clockwise direction about itsv pivot 59. as viewed in Fig. 13, to disengage the pawl from the tooth 56 of the holding ratchet 55. "As the disk 51 is now free and disconnected from the measuring roll shaft, the disk is quickly rotated in a counter-clockwise direction under the action of the shutter tensioning spring, not shown. Such rotation of the disk 51 serves to move the pin 59 out of the path of the bar id, and the latter quickly moves to the left, as viewed in Figs. 3, '7, and 8, under the action of a coil spring 58 one end of which is anchored to the camera body and the other end of which is secured to the portion 72 of the bar ill. The disengagement of the disk also frees the measuring roll shaft 48 so that the spring motor drive may rotate the film winding mechanism. In addition, such leftward movement of the bar M will bring the hook H into engagement with the teeth 75 of the counter to move the latter a distance sufiicient to indicate an exposure. In making some exposures, for example 5 of a second, the disk 5? may be rotated in a counter-clockwise direction a distance suficient to actually bring the pin. 59 into engagement with the ear 69 so as to cooperate with the spring d8 moving the bar 76 to counter actuating position.

The above-described mechanism thus provides an arrangement by which (1) the spring motor drive unit is locked when removed from the camera body (2) the winding of the film strip also serves to tension the shutter and to move the counter-actuating member into position to actuate the counter; and (3) the actuation of the trigger to make the exposure disconnects the shutter tensioning mechanism from the film winding mechanism and also actuates the counter to indicate the making of an exposure. These mechanisms are fully shown and described in the applicant's Patents No. 2,135,984 and No. 2,140,- 446, issued November 8, 1938, and December 13, 1938, respectively, and applicant's Patent No. 2,253,084. While the above-described mechanisms do not per se constitute a part of the present invention they do cooperate with a power unit locking mechanism embodied in the present invention. Therefore, to fully understand the operation of the present spring motor locking device, the description of the various mechanisms associated therewith are deemed essential. However, only so much of the mechanisms have been described as is necessary to fully understand the present invention.

The above-mentioned ear 69 may be formed integral with the bar IO. with such a construction, however, the quick rotation of the disk 51 after release of the shutter trigger might, in making certain exposures, cause the stud II to strike the ear "with considerable force and might tend to break or bend some of the parts. In order to eliminate such a condition, the ear is is preferably formed up from a member ID, of the shape best shown in Fig. 5, which is pivoted at 90 on the end of the bar It, as illustrated in Figs. 5 and 7. A coil spring Si is wrapped around the pivot II and has one end anchored to an extension 82 of the bar II and the other end secured to the member 0! and tends to rotate the latter in a counter-clockwise direction, as viewed in Fig. 5. such rotation is limited by the engagement of a downwardly extending lug 93 on the member 89 with an edge 94 of the bar 10, as shown in Fig. 5. Now, when the disk 51 is rotated during the film winding operation, the stud 58 will finally engage the left side of the car 69, as viewed in Fig. 5, to slide the bar 10 tothe right. At this time the bar 1 l0 and the member 89 moves as a unit and are, in

eflect, a single unit. However, when the disk 51 is disengaged, it will quickly rotate in the opposite I direction to bring the stud 59 into engagement with the right side of the ear 69. However, as the latter is formed on the member 89, the latter will move in a clockwise direction about its pivot 98, against, the action of the spring 9!, to gradually retard the stud 55, the advantages of which are obvious to those in the art. By means of this simple arrangement, the return of the stud 55 is cushioned, and any danger of bending or breaking of the parts is thereby eliminated.

As pointed out above. the actuation of the shutter trigger serves to disconnect the shutter tensioning shaft 66 and the measuring roll shaft 43. Such disconnection frees the latter so that it may be rotated to move the filnrstrip through the camera and to wind up the exposed film onto the take-up spoolSl. However, after the film has thus been wound and a new image area moved into exposing position, means must be provided for arresting further rotation of the measuring roll shaft to prevent further film movement. To this end, the present invention provides an arrangement for automatically and positively looking the spring motor or power unit at the end of the film winding operation.

Obviously, this locking mechanism could be applied to the spring motor 42 or to any of the gears which connect the spring motors to the governor shaft 4| or the dish-shaped gear 43. However, due to the mechanical advantage between the motor and governor shaft, the latter carries a relatively light load so that a slight pressure applied to the governor shaft will be suflicient to stop the operation of the spring motor drive and the film winding mechanism. The locking means is, therefore, preferably applied to the governor shaft. The latter has a portion which projects through a registering opening 96 of the plate 24, see Fig. 4, and has mounted on the free end thereof the disk 40 on which the locking lugs 38 are formed. These lugs are adapted to be engaged by the hook I! to lock the spring motor when the camera back is removed from the camera body, as above described. A locking plate or lever 81 is slidably mounted on the plate 24 adjacent the disk 40 and is connected thereto by means of rivets 98 which extend through slots 99 formed on the lever 91, as clearly illustrated in Fig. 3. The lower end of the locking lever is formed with a U-shaped offset portion III! which is adapted to engage one of the lugs 39 to also lock the governor shaft and hence the motor drive.

unit. A spring IIII is wrapped around a stud I02 on the plate 24 and has one end held in place thereon by a pin I03 while the other and engagesan upturned lug I04 on thelocking lever 91, as clearly illustrated in Fig. 3. This spring thus tends to lift or hold the lever 91 upwardly to bring the portion I into locking engagement with one of the lugs 39. Thus the lever 91 is also utilized to lock the motor drive mechanism. However, the lever 91 and hook 31 are not both in the looking engagement at the same time as will be later explained.

it is apparent that as long as the portion 91 is; in engagement with one of the lugs 39, the

drive will be effectively locked and the 'r. m winding mechanism will be inoperative to move the film strip. However, if the lever 91 is moved downwardly to disengage the lug 39, the motor will be free so. that it will then be eifective to rotate the shaft 48 to move and wind the film. At the completion of the winding operation, the portion 91 is again moved into locking engagement with one of the lugs 39 to arrest further movement of the spring motor drive. This movement of the lever 91 into locking engagement with the governor shaft is preferably controlled by the filth winding mechanism so as to be operated in timed relation therewith.

To this end, the intermediate portion 12 of the slidable bar 10 has connected thereto an extension I 06 the free end of which carries a pin I81 positioned in a slot I08 of a lever I09 pivoted at I I0 on a lug III on the wall 53, see Figs. 3 and 8. The lever I09 i formed with an arm H2 the free end of which is connected by a ball and socket joint H3 to the upper end of a push rod iI i slidably mounted in a sleeve H5 in the wall 53. A spool-shaped member I I6 is vertically slidable in the Wall 53 and has an upper flange III positioned in a recess H8 in the wall 53 and adapted to be engaged by the lower end H9 of the push rod H4, see Fig. 3. The lower end of the spool-member H6 is formed with a flange I26 adapted to engage a lug I2I formed on the upper end of the locking lever 91, see Fig, 3.

It is now apparent that when the bar 10 is slid to the right, as viewed in Fig. 3, by reason of the engagement of the stud 59 with the ear 69 during the film winding operation, the extension I06 of the bar 10, through the pin and slot connection I01 and I08, will pivot the lever I09 in a clockwise direction to move the lever I09 out of engagement with the spool-shaped member H6. The spring IOI will then become effective to slide the locking lever 91 and the member H6 upwardly to move the portion I00 into locking engagement with one of the lugs 39 to positively lock the spring motor drive and hence the film winding mechanism. However, upon operation of the shutter trigger 18, the bar 10 is freed and moves to the left, as viewed in Fig. 3, under the action of the spring .88. This leftward movement then pivots the lever I09 in a counter-clockwise direction, see Fig. 3, to move the lower flange I of the member I I6 into engagement with the lug I2I on the locking lever 91 to slide the latter downwardly and out of locking engagement with the lug 39 to free the motor drive unit so the latter may be rendered effective to rotate the film winding mechanism. While the spring 88 may be made of sufficient strength to move the bar 10 and the extension I05, as well as the lever I09, member H6, and locking lever 91, it is preferred to provide an auxiliary spring which will relieve spring 88 of some of its load. This auxiliary spring is in the form of a coil spring I22 wrapped around the pivot H0 and having one end hooked over the arm H2 and the other end. pressing against the pin I01 and the extension By means of the above-described mechanism, the locking lever 91 is moved into locking engagement with the governor shaft to effectively lock the spring motor drive at the completion of the film winding operation. The subsequent actuation of the shutter trigger then serves to move the lever 91 out of locking engagement to release the spring motor drive to wind the exposed film area. While the engagement of the locking lever 91 with the lug 39 of the governor shaft effectively locks the motor drive, it is referred to provide an additional or safety locking device which will cooperate with the locking lever 91. This safety lock comprises a tumbler lever I23 pivoted at I24 on the plate 53 and having the free end I25 positioned in a notch or recess I28 formed in the bar 10. The portion of the bar I0 forming the recess I25 is bent upwardly to provide 9. lug I21, the purpose of which will be later explained.

It is now apparent that any sliding movement of the bar 10 will serve to move the tumbler lever I23 about its pivot I24. Now when the bar 10 is moved to the right, Fig. 5, by the stud 59 during the film winding operation, the edge of the notch I26 engages the end I 25 of the lever I 23 to move the latter to the right to bring the holding lug I28 thereon into engagement with the shoulder I29 on the portion 52 of the measuring roll shaft to lock the latter, and hence the winding mechanism against further actuation. This tumbler lever I23 with its holding lug I28 is almost identical with the structure used in the well-known window shade to lock the spring thereof in tensioned position. This tumbler lever thus affords a safety latch which cooperates with the locking lever 91 to provide a dual lock for the motor drive and the film winding mechanism. As the lever 10 is slid in reverse direction by the springs 88 and I2I, the opposite edge of the recess I26 engages the tumbler latch I23 to move the lug I28 thereof out of locking engagement with the shoulder I29 to release the measuring roll shaft 48 as will be apparent from an inspection of Fig. 5.

It will be remembered that when the trigger 18 is depressed to make an exposure, the lug 86 on therelease lever 84 will pivot the pawl 58 to disengage the disk 51 so that the latter will rotate to move the stud 59 out of engagement with the sliding bar 10. As the latter is now free, it will tend to move under the action of the springs 88 and I22 to shift the locking lever 91 out of locking engagement with the motor drive so that the latter may easily become effective to shift the film. It is essential, however, both with instantaneous and delayed exposures, to positively insure that no movement of the film strip occurs until after the exposure has been completed.

To this end, the bar 10 is provided with the previously mentioned formed-up member or lug I21 which is positioned in the path of the lug 86 of the release lever 84. Now when the latter is moved to disengage the pawl 58 upon depression of the trigger 18, the lug 86 engages the lug I21 to lock the bar 10 against movement by the springs 88 and I22, thu effectively preventing disengagement of the locking lever 91 and hence movement of the film strip. when, however, the trigger 18 is released, the lug is moved away from the lug I21 so that the bar may move to disengage the locking lever 01 to free the spring motor drive. The above-described mechanism thus insures that the spring motor and the film winding mechanism are locked against further rotation at the completion of the film winding operation, and are retained in the lock-. ing position until the completion ,of exposure. Upon final operation of the shutter trigger, the spring motor is then released to wind the film.

When, however, the back 21 is to be removed from the camera, the looking lever 01 is preferably shifted to and retained in an inoperative position and out of locking engagement with the governor shaft 4|. The latter is then locked by reason of the engagement with the hook 31 with one of the lugs 39 of the governor shaft, as above described. When the back is to be removed, the button 29 is first rotated in the direction of the arrow, Fig. 3. Such rotation, similarly rotates a cam I30 carried by the stud 30 to move the cam into engagement with an inclined shoulder I31 of the locking lever 91, see Fig. 3.

Now by sliding the button to the right or to the position shown in Fig. 3, the hook $1 is moved into engagement with one of the lugs 30, while the cam I30 slides upwardly along the inclined shoulder ill togradually move the portion I of the locking lever 91 downwardly and out of engagement with the lug 39. The arrangement is such that the hook 31 engages the lug 30 slightly in advance of the disengagement of the portion I00 therefrom. When, however, the back is again secured to the camera, the button is slid to the left, Fig. 3, to disengage the hook 31 from and to engage the portion III with the lug 30. The button is then rotated in a counter-clockwise direction, as viewed in Fig. 3, to lock the back to the camera and to simultaneously move the cam I out of en agement with the shoulder Hi. The locking lever 91 is then moved upwardly by the spring I 0| to bring the lug IZI into engagement with the lower flange I20 and the spool-shaped member H6. As the latter and the push rod Ill move as a' unit they may be broadly considered as a unitary reciprocating member.

While the operation of the various mechanisms have been described in detail, such operation may be briefly summarized as follows: When the camera back, or the motor drive, is detached from the camera, the motor drive locking members are in the position shown in Fig. 3.

After placing the back on the camera ,body, the button 29 is slid to the left and rotated in a counwind the exposed film onto the take-up spool ll. Subh rotation of the shaft 48 causes the ratchet it to engage the pawl 58 to also rotate the disk 51 as a unit with the shaft 48.

At the completion of the film winding opera-' tion, the pivoted stud 50 of the pawl 58 engages the ear 6! on the bar 10 to slide the latter in the opposite direction to move the spool-like member Ht out of engagementwith the lug [2! formed on the upper end of the locking lever 81. As the latter is now unrestrained, it will be urged upwardly by its spring I0! to again bring the portion I00 into locking engagement with the lug 39 to lock the motor drive. Simultaneously with the locking of the moton drive, the tumbler lever I23 is moved by the bar 10 to bring the holding lug I28 into locking engagement with the shoulder I29 on the portion 02' of the measuring roll shaft 48 to lock the latter, and hence the film I It is thus apparent from the present invention that the present invention provides an arrangement for effectively locking. the spring motor a drive at the completion of each winding operaterclockwise direction, as viewed in Fig. 3. Such movement disengages the hook 31 from and moves the portion I00 on the locking lever 91 into engagement with the lug 39, assuming of course that the shutter is tensioned. Now upon actuation of the shutter trigger 18, the lug 86 of the release lever 84 engages the pawl 58 to disengage the disk 51 from the measuring roll shaft 48. The disk 51 is then quickly rotated, under the action of the shutter spring, to move the stud 59 out of engagement with the ear 8!! so that the bar10 may slide under the action of the springs 88 and H2 to move the locking lever 91 downwardly to disengage the portion I00 thereof from the lug 39 and simultaneously to disengage the tumbler lever I23 from the measuring roll shaft 48. The spring motor drive is now free and operates to rotate the measuring roll shaft 48 to move the film strip across the camera and to tion and for also releasing the motor drive upon the making of an exposure. Such locking mechanism is controlled by and intimed relation with the film winding mechanism. Furthermore as the locking device engages the governor shaft of the motor drive unit, little power is required to effect such locking. The release of the shutter trigger then serves to disengage the spring motor drive so the latter may become eilective to wind the film strip. However, the film motor drive is not released until the exposure has been completed so that no film movement occurs during the exposure, the advantages ofwhich are obvious to those in the art.

While one embodiment of the invention has been disclosed, it is to be understood that the inventive idea may be carried out in a number of ways. This application is therefore not to be limited to the precise details described but is intended to cover all variations and modifications thereof falling within the scope of the appended claims.

I claim:

1. In a camera, the combination with a camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding means and adapted to operate the latter to move a film strip through said camera, of a lever slidably mounted on said body and arranged to be moved into and out of locking engagement with said power unit, means including a sliding bar mounted on said body adjacent said lever and adapted to engage said lever both to shift and to hold positively the latter out of locking engagement with said power unit to permit the latter to move said strip, means controlled by said winding means for moving said lever shifting means out of engagement with said lever only after a predetermined length of film has been moved by said winding'means, and means for then moving said lever into locking engagement with said power unit to arrest the rotation of said winding means.

2. In a camera, the combination with a camera body, film winding means rotatably mounted on said body, a. power drive unit connected to said winding means and adapted to operate the latter to move a film strip through said camera, of a lever mounted on said body and arranged to be moved into and out of locking engagement with said power unit, a push rod siidably mounted on said body, means for moving the push rod into engagement with said lever both to shift and to hold the latter out of locking engagement with said power unit to permit the latter to move said strip, means controlled by said winding means for shifting said rod to a retracted position and out of engagement with said lever only at the completion of the film winding operation to free the lever in timed relation to the movevrnent of said winding means, and means for concomitantly shifting said lever into locking engagernent with said power unit to arrest the rotation of said winding means.

3. In a camera, the combination with a camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding means and adapted to operate the latter to move a film strip through said camera, of a lever mounted on said body and arranged to be [moved into and out of locking engagement with said power unit, a push rod slidably mounted on said body, means independent of said winding means for moving said push rod into engagement with said lever both to shift and to hold the latter out of locking engagement with said power unit to free the latter so that it may become effective to move said strip, means controlled by and in timed relation with said winding means for moving said push rod out of engagement with said lever to free the latter only after a, predetermined length of film has been moved by said winding means, and means independent of the operation of said winding means for simultaneously moving said lever into locking engagement with said power unit to arrest the rotationof said winding means.

4. In a camera, the combination with a camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding means and adapted to operate the latter to move a film strip through said camera, of a lever mounted on said body and arranged to be moved into and out of locking engagement with said power unit, means movable into engagement with said lever to shift the latter out of locking engagement with said power unit to free the latter so that it may be rendered effective to move said strip, means controlled by said winding means for moving said lever shifting means out of engagement with said lever to free the latter after a predetermined length of'film has been moved 1 by said winding means, means actuated by said winding means for holding said lever shifting means out of engagement with said lever, and means independent of said winding means for then moving the freed lever into engagement with said power drive to arrest further operation of said winding means.

5. In a camera, the combination with a camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding means and adapted to operate, the latter to move a film strip through said camera, of a lever mounted on said body and arranged to be moved into and out of locking engagement with strip, means controlled by said winding means for moving said lever shitting means out of engagement with said lever to free the latter after a predetermined length of film has been moved by said winding means, means actuated by said winding means for holding said lever shiftin means out of engagement with said lever, means independent of said winding means for then moving the freed lever into engagement with said power drive to arrest further operation of said winding means, and manual control means for releasing said lever shifting means from its mov ing and holding means so that it may be moved to shift said lever out of locking engagement with said power unit.

6. In a camera, the combination with a camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding meansand adapted to operate the latter to move a film strip through said camera, of a lever mounted on said body and arranged to be moved into and out of locking engagement with said power unit, means movably mounted on said body adjacent said lever and adapted to shift the latter out of locking engagement with said power unit to permit the latter to move said strip, a slidable bar mo'mted on said body and connected to said lever shifting means, means for'sliding said bar in one direction to move said lever shifting means to shift said lever, a member connectable to said winding means, means on said member arranged to engage and slide said bar in the opposite direction to move said lever shifting winding means and said bar for moving the freed leverinto locking engagement with said power unit.

7. In a camera, the combination with a'camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding means and adapted to operate the latter to move a film strip through said camera, of a lever mounted on said body and arranged to be moved into and out of locking engagement with said power unit, means movably mounted on said body adjacent said lever and adapted to shift the latter out or looking engagement with said power unit to permit the latter to move said strip, a slidable bar mounted on said body and connected to said lever shifting means, means for sliding said bar in one direction to move said lever shifting means to shift said lever, a member connectable to said winding means, means on said member arranged to engage and slide said bar in the opposite direction to move said lever shifting means out of engagement with said lever to free the latter after a predetermined length of film has been wound, and manual control means for disengagement with said bar so that said bar slidingmeans becomes efiective to move said lever shifting means to shift said lever out of locking engagement with said power unit so that said winding means may be rotated to wind said film.

8. In a camera, the combination with a camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding means and adapted to operate the latter to move a film strip through said camera, of a lever mounted on said body and arranged to be moved into and out of locking engagement with said power unit, means movably mounted on said body adjacent said lever and adapted to shift the latter out of locking ent into said power unit to. permit the latter to move said strip, means controlled bysaid winding means for moving said lever shifting means out of engagement with said lever after a predetermined length of film has been moved by said winding means, and auxiliary power-unit locking means actuated by said winding means.

9. In a camera, the combination with a camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding means and adapted tdoperate the latter to move a film strip through said camera, of a lever mounted on said body and arranged to be moved into and out of locking engagement with said power unit, means movably mounted on said body adjacent said lever and adapted to shift the latter out of locking engagement with said power unit to permit the latter to move said strip, a slidable bar mounted on said body and connected to said lever shifting means, means for sliding said bar in one direction to move said lever shifting means to shift said lever, a member connectable to said winding means, means on said member arranged to engage and slide said bar in the opposite direction to move said lever shifting means out of engagement with said lever to free the latter after a predetermined length of film has been wound, an arm pivotally mounted on said body and arranged to be engaged and moved by said bar, means on said arm adapted to engage and lock said winding means when said bar is slid in said opposite direction, and spring means operatively connected to said lever for moving the latter, when freed, into locking engagement with said power means, said arm and lever ooto move a film strip through said camera, a shutter release trigger mounted on said body, of a lever mounted on said body and arranged to be moved into and out of locking engagement with said power unit, a member mounted on said body and movable in one direction to engage and move said lever to dmconnect the latter from said power unit to render the latter ell'ective to rotate said winding means, means controlled by said trigger for moving said member in said one direction, means controlled by said trigger for arresting such movement of said member until the completion of the film exposing operation, means controlled by said winding means for. moving said member in the opposite direction to disengage said member from said lever to free the latter after a predetermined length of film has been wound by said winding means, means for moving the freed lever into locking engagement with said power unit, and auxiliary locking means controlled by said winding means and movable into locking engagement therewith substantially simultaneously with the locking of said power unit.

12. In a camera, the combination with a camera body, a film measuring-roll shaft rotatably mounted in said body and adapted to engage and move a film strip thereacross, a power drive unit carried by said body and connected to said shaft to operate the latter, a shutter release trigger positioned on said body adjacent said shaft, a

I ratchet on said shaft, a second shaft in axial operating to lock said power unit and said winding. means when a predetermined length of film has been moved by said winding means.

10. Ina camera, the combination with a camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding means and adapted to operate the latter to move a film strip through said camera, a

shutter release trigger mounted on said body, of a lever slidably mounted on said body and adapted to be moved into and out of locking engagement with said power unit, a push rod mounted for reciprocating movement on said body and arranged to be moved into engagement with 'said lever to shift the latter. out of engagement with said power unit to render the latter effective to operate said winding means, a bar slidably mounted on said body and operatively connected to said push rod, means controlled by said trigger for shifting said bar in one direction to move said rod into engagement with said lever only upon the completion of an exposure to disengage the latter from said power unit to free the latter, means controlled by said winding means for shifting said bar in the opposite direction to move said rod out of engagement with said lever, a spring for then sliding said lever into locking engagement with said power unit, an arm pivotally mounted on said body and movable by said bar, and auxiliary locking means comprising cooperating portions on said arm and said winding means arranged to be moved into interengaging relation to lock said winding means when said bar is slid insaid opposite-direction.

11. In a camera, the combination with a camera body, film winding means rotatably mounted on said body, a power drive unit connected to said winding means and adapted to operate the latter alignment with said first shaft, a disk loosely mounted on said second shaft, a pawl pivotally carried-by said disk and movable into engagement with said ratchet to releasably connect said disk to said first shaft, 'of a lever slidably mounted on said body and having a portion thereof adapted to be moved into and out of locking engagement 'with said power unit, a push rod reciprocally mounted on said body and movable into and out of enga ement with said lever, a bar slidably mounted on said body and operatively connected to said push rod, a pin on said disk arranged upon rotation of said shaft to engage said bar to slide the latter in one direction to move said rod out of engagement with said lever. when a predetermined length of film has been moved by said first shaft, a spring connected to said lever to shift the latter to move said portion into locking engagement with said power unit, an arm pivotaliy mounted on said body adjacent said second shaft and arranged to be engaged and moved by said bar, a shoulder on said first shaft adjacent said disk, a lug on said arm movable into engagement with said shoulder when said bar is moved in said one direction to lock said first shaft substantially simultaneously with the locking of said power unit, a release member operatively connected to said trigger, means on said release member arranged to engage said pawl upon actu-. ation of said trigger to disengage the pawl from said ratchet and to disconnect the disk from said first shaft to allow said pin to be moved out of engagement with said bar, an upturned ear on,

unit, the movement of said bar in said opposite direction also serving to move said arm to disengage the lug thereon from the shoulder on said first shaft to free the latter.

13. In a camera, the combination with a camera body, a film measuring roll shaft rotatably mounted in said body and adapted to engage and move a film strip thereacross, a power drive unit body and movable to one position to engage said lever to shift the latter out of locking engagement with said power unit, means for operatively connecting said rotatable member and said reciprocal member so that the latter will be moved out of said one position and to another position to disengage said lever when a predetermined length of film has been moved by said winding means. means for then shifting said lever'into locking engagement with said power unit for arresting further rotation of said winding means,

an exposure control member positioned on said body, means actuated .by said control member for disconnecting said clutch to disengage said reciprocally mounted member from said rotatable member, and means for then moving said reciprocal member to said one position to shift said era body, a film measuring roll shaft rotatably mounted in said body and adapted to engage and move a filmstrip thereacross, a power drive unit 'connected to said shaft to operate the latter, a second shaftwin axial alignment with said first shaft, a rotatable member mounted on said second shaft, clutch means for releasably connecting said member to said first shaft, of a lever slidably mounted on said body and movable into and out of locking engagement with said power unit, a member reciprocally mounted on said body and movable to one position to engage said lever to shift the latter out of'locking engagement with said power unit, means for operatively connecting said rotatable member and said reciprocal member so that the latter will be moved out of said'one position and to another position to disengage said lever when a predetermined length of film has been moved by said winding means. means for then shifting said lever into locking engagement with said power unit for arresting further rotation ofsaid winding means, an exposure control member positioned on said body, means actuated by said control member for disconnecting said clutch to disengage said reciprocally-mounted member from said rotatable member, means for then moving said reciprocal member to said one position to shift said lever out of locking engagement with said power unit,

lever out of locking engagement with said power unit.

14. In a camera, the combination with a camand auxiliary locking means controlled by said winding means and arranged to engage said first shaft to iock the latter at the end of the winding operation.

. JOSEPH MIHALYI.